Blue-green silicate luminescent material

Abstract

The present invention provides blue-green silicate luminescent materials, which are rare earth activated alkaline-earth metals silicates having a formula of Ba 1-b M b Si 2 O (5-a/2) D a :Eu x , Ln y , wherein M is one or two elements selected from the group consisting of Mg, Ca and Sr; D is one or two ions selected from the group consisting of Cl − and F − ; Ln is an ion selected from Ce, Er, Pr or Mn; a, b, x, and y are molar coefficients and within following ranges: 0≦a<2, 0≦b<0.5, 0<x<1, 0≦y<0.5. the blue-green silicate luminescent material can be excited by UV, violet and blue lights of 200 nm-450 nm and emit blue-green light with a peak wavelength of around 490-510 nm. The luminescent materials can be used not only in color-rendering index adjustment of tricolor lamps and white-light LED, but also in decoration and lighting with special colors.

1 . A blue-green silicate luminescent material, characterized in that the material has a formula:
   Ba 1-b M b Si 2 O (5-a/2) D a :Eu x , Ln y   (1)
   
       wherein M is one or two elements selected from the group consisting of Mg, Ca and Sr; D is one or two ions selected from the group consisting of Cl −  and F − ; Ln is an ion selected from Ce, Er, Pr or Mn; a, b, x, and y are molar coefficients and within following ranges: 0≦a<2, 0≦b<0.5, 0<x<1, 0≦y<0.5; and wherein the blue-green silicate luminescent material can be excited by UV, violet and blue lights of 200 nm to 450 nm and emit blue-green light with a peak wavelength of 490-510 nm. 
     
     
         2 - 3 . (canceled) 
     
     
         4 . The blue-green silicate luminescent material according to  claim 1 , wherein the molar coefficients a, b, x, and y are within following ranges: 0<a<1, 0≦b<0.5, 0<x<0.5, 0≦y<0.2. 
     
     
         5 . The blue-green silicate luminescent material according to  claim 1 , wherein the molar coefficients a, b, x, and y are within following ranges: 0<a<1, 0≦b<0.5, 0<x<0.5, 0<y<0.2.